Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0cb5e39df86b7833ce2f345ddec9ba2c6d6b1b1fa6322b40005eb98756e7139' 
  AND token = '4rlhiRPJ3cDe37r+B7nFJjiym3OMDRt38gvUvJyYUGA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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