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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fe9ed6592310676893a22c45b06982d2987d8b30c2316d23ec5bb028876a7993' 
  AND token = 'CQNrGuKRI0nwlO04LG2j7d1WzshkGFJ3oWulA3as6m8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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