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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0e0b64389cd6f8c710dc6107dc73a82a97159358c2039f7baecf921d2cd404bd' 
  AND token = '+enH4QapNX1BNsDp2BnXojH97HvWOYWPnrBrMrrnOCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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