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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'a8c90c11907802a1de4b8c9283370228092e64cbc3ee8936ffd777058c6cd7ee' 
  AND token = 'sjyaaBPWwb8RoEFU5saJUM7IPqQR30jeKxmtY7G6+KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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