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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'cb09b545e04f18254a6b9baa24394269f22125de31da22ec28aac7b22b5ecc0f' 
  AND token = 'Lqpf+na7mNHRn9/+QlVQUHjEFPsPPmzf8lGfXXo0q7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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