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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '5ee47bd38aa0a5b7e07e8df773e97443b93a57b9e7c1128a6bbaa1ce8a0968d5' 
  AND token = '4iFKHEmy3wiWh/VMUPRjPkdzLH5LDV0IFdMwTmXe1OA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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