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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'c9026dbde004e8d2c3055f62c600e2ed23b83d6be8d6f7bbe299ec2858931d4d' 
  AND token = 'b9BUsGcUtPNvaye8ubKRg1qAl6l2Jg0gWvKNnRxWJP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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