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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'fcdb503a3ce3a28bcd6329ff734e1c74ada33012358f95a2b051c29531857364' 
  AND token = 'Pn8hpMp5QybrCFW4D+2I0TZspR9R7bnCVJAcJKobFiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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