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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'ad1188d34ecdb5317145ca3be8a1d5c721fe562491261d693f4e185845e86cf0' 
  AND token = 'WpUt5hwXoDV5GBIiOSzPIn19LjdHAPuOnnqWhQkBORo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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