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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '668236aa134e1e12614425bd6b9ca47cf6f68ec9fe7293798fa16112c80cfad1' 
  AND token = 'UKHXHQuenNRiTQxQVkSH2c4frIrYRwj4f59I8Npt1I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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