Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7b1e67246f7424ffe296fc815e4f3d7d39bd43da00ccb189aa62f7cb91b4fbc' 
  AND token = 'cHXcbYH4r+sEQS2G3liAnRrQR87tVgOcKHzxxPrOSK4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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