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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '8f8374d9a5d6f31b1c3f5487c37cd77b9f4ca09742cefc5523d4a2a2cd83b6bd' 
  AND token = 'Pp9jDYtYHV2wMCsXdXXTjtQmgB43XE5fPmXBgjxovi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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