Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f398fb4856ec94f2499662e42c826a3ba46d1a10ab6492c30dcfcd0d795ced7' 
  AND token = 'NxypgSd7HQKk4rEbfiNfrC/Rjg50XpynMlZVf2RsW04=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}