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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '553689cd0eda0eaeb37d15573858eabf0a1970bb96beef2912608601ab4cc04b' 
  AND token = 'KidJ92lIQ0o5hril/0i4ybWpvDTgkh7QLwtqaANsSN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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