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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ebd19c120cefbd6dc198c19f464cd38cb75cbef8eae59569df6be034473022c3' 
  AND token = 'e/LAKszvd9OmLnoEy5cE5iL5YVCZ8nj+CpcFt+vhz4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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