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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0acd0226a2e895b56700d84e1d13fa818b43dd76421c0dd711844264347e3471' 
  AND token = '8blCFwHqccwfBSXcCHblOFJ7bnsBhph2Fn8YX1aLrto=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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