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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8828defc59ef801658ca73fbf54607cdf62feb88511197fde559f4693e6d8f9d' 
  AND token = 'mswMJxUNf4kxRZ856jTjQzCEVubpvUOol/NYlLs0Fls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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