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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'fa5bb057343380b753765e96b873c47d14662447ef48a6e722738345e08b5297' 
  AND token = 'eTjmNAIp3H2sYmzk1Uh8szlK8SbfaKbMKQBcQ9DDEoU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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