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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '73c02939b694a3048b1d3b37c9f39435c31edeee0bf7c1f221568b5bb5afb932' 
  AND token = 'RQRnIlA5XogXkA4EOf/2n1PSTu5oLocQcHLC/bigeUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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