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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '989eb72a373e8db89f65afa269b9bff480810d8837311cd73611dcc94f1275a9' 
  AND token = '8rhPY9C7Tr5lirHx/RQYWYQraecsRx+VCZR4K455XhY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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