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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '9002823de48566f16e046014eb38bde0c1840468c43ab4dfb6fb8f703aa8ddb2' 
  AND token = 'AVu7OMd4QcyViLx+afzZ3wcywiQV4Qfl347mlZxcxEc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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