SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '630e70ad2e29ca270f234e8490176bf9fb85daf226953175428cef778fafc9ae' 
  AND token = 'CsSVNZdYFGbKTLYsnZvbsyZSyPmHqjHU1k6P6hcDwF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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