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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c034472f1c98708dbaa01746ec8e48471534cedaf0903ef8ef4a77e60ebc337a' 
  AND token = '7U+59gefbc+Ko0IWSa5gIBJSl3fN89Y76/9tElJYj9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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