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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'a121cc7d7735aef94766f0bdd8edde840dc314cb5358506688ce971be2563b21' 
  AND token = 'Av2yPRSKCa4k08lJ244rZ6VyCz4yDOcrfKee2xFo1Fw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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