SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '1a299a9965f02ac4f0eb28c2371b71e7a8b396f95360450987b076e986602d42' 
  AND token = '2Zjm1q0UkcNTk6tpx+nik+CQs6mhFi3Klhfn1MBsYVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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