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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'e7dd67adf25f5736bd909949337ba350c974af6a591c0a8a2a7e0aad1a9f3e20' 
  AND token = 'xayk+XJxE6HsLDjwtep1GuPENuvn23zaoYRX0/rY278=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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