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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'aa8b48880b8a04bd2d3ef5b77b4bae2c00ab2ae2767408246c3cdb5cbc2a9f59' 
  AND token = 'PClM44NvVFBlB9C9SWX+IU6eMij7FnPoeGulphRyBC8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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