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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a0a6ca2676241db448078eccef05b514e4779bdd72ac2b51944bedb5dff5adef' 
  AND token = 'Bk7e3DyW+BIq+RIpONLZVx3HaYmiFJtEubk9Cmba0Q4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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