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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '048e0349a0f3879dc0375c1ccc2e9ed8d0b5a1bbea49102eedf666c7d330883d' 
  AND token = 'jZsOpS10CtvZgdlq1m/FJhwNAafUs0wzzQCecF/HLn8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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