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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '84d41da12f28fc5f933fda450176dc65a53261a828474adb1588d0b1271d18c2' 
  AND token = 'H5GxnFAIfaltwJQXf8Qx4Hbh8uRN5P+lfpfqOp5nT8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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