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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8f55ba78dbdfdae5ba4a97732c529c88895922cdfbcdf42e4302c91c3825eb1d' 
  AND token = 'wERZSZEKmcf2vXKyZlm9Q6T6eTkKhNs5yi4xamGoT+c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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