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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '635938a211eac2635d8f26f3583e575875522eaa3a7d9fcdd45818f58f84bf4d' 
  AND token = 'Lu2utKzE/NLWQqGvsd7i1nm3kaQsTcdKIF+WdD5mwb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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