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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '155fa118fe88ce20a6adce186002a2b510ee4decc9e02fdcddd5957de727f44f' 
  AND token = '6yz3XgaiWdwarQ9LRATNqo1jrSUnognXBBHEshaO364=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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