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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2f98b5b49024d72e63e331a1b0ea22e7dd4adf91b964716a2c0fa1bf26fc2261' 
  AND token = '+wkp5/1W4218UgoQtX3ktGano+ocs+8OHPuZrI4H7qs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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