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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e5c6004f6347c113a98faae2036a1266d9cbfef3385a10edc255dc1c7d3c8e36' 
  AND token = '48Ako8MaSTeM0jrgj08CBptV+HehzQdF1FOVs3sLKu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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