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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'c58477e85349c462de7edfeb942f6bf793ce448e2a5396aac7e9334c99d35a2e' 
  AND token = 'XDn9Ie0eFTEBABUngeJwfB5tq0z1M0JuLeIz5W38eXQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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