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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3655b72b5bbc7283c78e82f35c8a21d2a00ac9b707153fac643096f7f05fbed7' 
  AND token = 'IrPTyS8dtaapSEtlm7HQd/n+VqLg+R/H5okwLKnS8f0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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