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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '58682d4ec6dbe7c9a13a04a46f45ff8c27ca82ac62c7c6bca32ef9722b00bff0' 
  AND token = 'UZbGccfy9E2qn2kKR7Nxu3X+fF01iNa751PceY9hOj4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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