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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7697b6c74bcdd32664533b4572f76cd22b9a31f22a001a55d19f2be45cbfdfce' 
  AND token = 'ko1mkoyKLW4k4AZ8z7vbx3yGlSUko3mqdvovEHwt5u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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