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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'dbcdd59a0813d335f5923afe959b70a2164d46f64bfbf0f83bef03a5c03c21b6' 
  AND token = 'j5iREM6gPr0kr9gCZCBpR5R3StwVvzQYa4FM32CpGeY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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