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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '583ddc1b13936def728142aa8a9b87c8e5a6314bbd2e889e9d35abb8f2451f87' 
  AND token = 'x9OeRsV2dajm5a9t6qKaJiKpgt7HCBLeOr3T6+Ih5vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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