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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '4fa05574c182c4473b7cae3edbaf614367a679016be41d19f52b234a143f16a0' 
  AND token = '7NyO3J0+9Dk0ojS4iZH3Kf/1BlLi7FUFCxACwAsLjKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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