SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'e9a9df2323e042820b29fe736171c4d8ef4a97234e44a2968388ca993a6d30ac' 
  AND token = 'INuzLEuzdVMErIJnHGWESsRcVMx/v5nKj/TKgiPwmno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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