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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '301372cc158daaf978e1fea9548a9b2d9ecb5a9e5cc086e0cdb1214dc2463650' 
  AND token = 'iImW6yUM+0wsTSiXuGyMm+1/JGbUqm48qrCmhz/T0Zk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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