Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a84c42948997f7e9f86b5566f4dc26b10b92738c64e7d282f5acdba0d6cd9382' 
  AND token = 'dR96ZadP/3VvutCTLw+5xcr8YxgZFslb1I4b1v8pnO0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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