Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d76a1778d4d72141cd5ad7d510954a2e4b62ffb8921f4063d2b3ccff2c874c9' 
  AND token = 'rgk/L0HQKhFPn9fPuwmFa0rKrRdVe4fka4BNwSZPCRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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