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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '10faf1a98fa05a7a0fcb992e60a570696e041c8187d293e2b139e09d015ce00c' 
  AND token = 'BOpXiXmsMXTJ02+vzbsfRsN5VHfQj/J57z9BDOdrWv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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