Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e7b55369be533701ebac5f0f28634df423ed97f0b942edf73475ffc64ab39e2' 
  AND token = '8IlF49VkzCG0rEJ7rbktUbt77NbyAbqyVjxC4rKHXd0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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