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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '8a0845e78753c50703c466b95a6682c7d338e22e1147d0a1b101db4a3a89fe17' 
  AND token = 'AS5xm5+nHw0pD1/m74b6FcIsL3wAdkFmD+Ke+oF1cJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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