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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '50a181df7d7124b2bd2cc0e26f2c83832c433ac5ee9cd712fc2e1b459ba066c7' 
  AND token = '9Shut2XnLoInbvmUkCzHTpYvPsErFY1sssws7mhWl5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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