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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58ec1c30f6e38d6d41b0ac1140a3e3526a9dd44de5f41f0ec592c5ecedd7148a' 
  AND token = 'AsQ8G3O9Kvzg9RN9Fm00QxRbAvpc3fwt4hqgR2SWbyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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