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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '85e7ce643fd19090b403cc70020e12ac689743446ab88148edac9b81312cdb2e' 
  AND token = '3Ta8x80STYJKaj2p808dm6oBfahfb4mPtPo05T3fW7k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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