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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'af0aff43d96590e1417c722e4e0bd8d36c249cd543ccbb3b6b4bc8b0fcb96b6e' 
  AND token = 'hublCkYkY7kpNf+V7zNJFZs+NTxhPDOYmXytYLEWiZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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