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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '30cca8f0f68ae84a7b7508b9d209802d51449a8d6f61e099ddd7aff9b6d2e440' 
  AND token = 'ejPrUovq0Bt1OXYKjSwbxtyyNSpL9fc7XootGnOsmEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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