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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'aa1a920602248df08f49f11fa02b1d2fae105bd78013dfe000330aaa59b59884' 
  AND token = 'YJWHokk5hg9Wz3c/1lgV4UGY3U3HhciZePZhfZs3qgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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