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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'da885e27d38c788fbcfbefd8e23f3a9af03790e2a0ae496ecc0d33119211de6a' 
  AND token = 'vR3yIp4V78iQRi9ZgxbHdlguXQCwFT2XBCb3GJVjH/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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