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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '373c4f8067195b8d54b01e45ddd2d012c92933d7c5012e8987667650636ec69b' 
  AND token = '3QEKayOx1J9Ar3M4jUkvba42T4PwvTNllTKCCGNygEw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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